package com.mohammadag.soundrecorder;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class WavConverter {
	private static final long SAMPLE_RATE = RecordingService.SAMPLING_RATE;
	private static final int RECORDER_BPP = 16;
	private static final int CHANNELS = 1;
	private static final long BYTE_RATE = RECORDER_BPP * 441000 * CHANNELS/8;

	public static void copyWaveFile(String inFilename, String outFilename, int bufferSize){
		FileInputStream in = null;
		FileOutputStream out = null;
		long totalAudioLen = 0;
		long totalDataLen = totalAudioLen + 36;

		byte[] data = new byte[bufferSize];

		try {
			in = new FileInputStream(inFilename);
			out = new FileOutputStream(outFilename);
			totalAudioLen = in.getChannel().size();
			totalDataLen = totalAudioLen + 36;

			writeWaveFileHeader(out, totalAudioLen, totalDataLen,
					SAMPLE_RATE, CHANNELS, BYTE_RATE);

			while (in.read(data) != -1) {
				out.write(data);
			}

			in.close();
			out.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private static void writeWaveFileHeader(
			FileOutputStream out, long totalAudioLen,
			long totalDataLen, long longSampleRate, int channels,
			long byteRate) throws IOException {

		byte[] header = new byte[44];

		header[0] = 'R';  // RIFF/WAVE header
		header[1] = 'I';
		header[2] = 'F';
		header[3] = 'F';
		header[4] = (byte) (totalDataLen & 0xff);
		header[5] = (byte) ((totalDataLen >> 8) & 0xff);
		header[6] = (byte) ((totalDataLen >> 16) & 0xff);
		header[7] = (byte) ((totalDataLen >> 24) & 0xff);
		header[8] = 'W';
		header[9] = 'A';
		header[10] = 'V';
		header[11] = 'E';
		header[12] = 'f';  // 'fmt ' chunk
		header[13] = 'm';
		header[14] = 't';
		header[15] = ' ';
		header[16] = 16;  // 4 bytes: size of 'fmt ' chunk
		header[17] = 0;
		header[18] = 0;
		header[19] = 0;
		header[20] = 1;  // format = 1
		header[21] = 0;
		header[22] = (byte) channels;
		header[23] = 0;
		header[24] = (byte) (longSampleRate & 0xff);
		header[25] = (byte) ((longSampleRate >> 8) & 0xff);
		header[26] = (byte) ((longSampleRate >> 16) & 0xff);
		header[27] = (byte) ((longSampleRate >> 24) & 0xff);
		header[28] = (byte) (byteRate & 0xff);
		header[29] = (byte) ((byteRate >> 8) & 0xff);
		header[30] = (byte) ((byteRate >> 16) & 0xff);
		header[31] = (byte) ((byteRate >> 24) & 0xff);
		header[32] = (byte) (2 * 16 / 8);  // block align
		header[33] = 0;
		header[34] = RECORDER_BPP;  // bits per sample
		header[35] = 0;
		header[36] = 'd';
		header[37] = 'a';
		header[38] = 't';
		header[39] = 'a';
		header[40] = (byte) (totalAudioLen & 0xff);
		header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
		header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
		header[43] = (byte) ((totalAudioLen >> 24) & 0xff);

		out.write(header, 0, 44);
	}

}
